<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">
        退出
      </el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#400EFF" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <!-- 加了：才能识别false而不是一个字符串 router开启路由模式 -->
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 绑定动态index,为了让一级菜单都各自能单独打开，值为item.id+''是因为恰好item.id是唯一的,+''是因为index只识别字符串 -->
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <!-- 二级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主体内容 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    data() {
      return {
        //左侧菜单栏数据
        menulist: [],
        //一级标题的图标
        iconsObj: {
          '125': 'iconfont icon-user',
          '103': 'iconfont icon-tijikongjian',
          '101': 'iconfont icon-shangpin',
          '102': 'iconfont icon-danju',
          '145': 'iconfont icon-baobiao',
        },
        isCollapse:false,
        //被激活的链接地址
        activePath:''
      }
    },
    created() {
      this.getMenuList()
      this.activePath=window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        window.sessionStorage.clear();
        this.$router.push("/login");
      },
      async getMenuList() {
        //将data属性解构出来并重命名为res进行接收
        const {
          data: res
        } = await this.$http.get('menus')
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        } else {
          this.menulist = res.data
          console.log(res)
        }
      },
      //点击按钮，切换菜单的折叠与展开
      toggleCollapse(){
        this.isCollapse=!this.isCollapse
      },
      //保存链接的激活状态
      saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath=activePath
      }
    }
  }

</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    //元素位于容器中心
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
  }

  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
